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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Gereon Kremer |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Utilities for non-linear constraints. |
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*/ |
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#ifndef CVC5__THEORY__ARITH__NL__EXT__CONSTRAINT_H |
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#define CVC5__THEORY__ARITH__NL__EXT__CONSTRAINT_H |
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#include <map> |
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#include <vector> |
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#include "expr/kind.h" |
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#include "expr/node.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace arith { |
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namespace nl { |
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class MonomialDb; |
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/** constraint information |
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* |
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* The struct ( d_rhs, d_coeff, d_type ) represents that a literal is of the |
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* form (d_coeff * x) <d_type> d_rhs. |
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*/ |
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struct ConstraintInfo |
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{ |
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public: |
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/** The term on the right hand side of the constraint */ |
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Node d_rhs; |
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/** The coefficent */ |
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Node d_coeff; |
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/** The type (relation) of the constraint */ |
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Kind d_type; |
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}; /* struct ConstraintInfo */ |
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/** A database for constraints */ |
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class ConstraintDb |
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{ |
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public: |
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ConstraintDb(MonomialDb& mdb); |
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~ConstraintDb() {} |
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/** register constraint |
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* |
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* This ensures that atom is in the domain of the constraints maintained by |
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* this database. |
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*/ |
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void registerConstraint(Node atom); |
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/** get constraints |
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* |
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* Returns a map m such that whenever |
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* m[lit][x] = ( r, coeff, k ), then |
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* ( lit <=> (coeff * x) <k> r ) |
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*/ |
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const std::map<Node, std::map<Node, ConstraintInfo> >& getConstraints(); |
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/** Returns true if m is of maximal degree in atom |
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* |
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* For example, for atom x^2 + x*y + y >=0, the monomials x^2 and x*y |
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* are of maximal degree (2). |
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*/ |
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bool isMaximal(Node atom, Node m) const; |
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private: |
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/** Reference to a monomial database */ |
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MonomialDb& d_mdb; |
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/** List of all constraints */ |
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std::vector<Node> d_constraints; |
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/** Is maximal degree */ |
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std::map<Node, std::map<Node, bool> > d_c_info_maxm; |
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/** Constraint information */ |
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std::map<Node, std::map<Node, ConstraintInfo> > d_c_info; |
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}; |
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} // namespace nl |
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} // namespace arith |
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} // namespace theory |
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} // namespace cvc5 |
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#endif /* CVC5__THEORY__ARITH__NL_SOLVER_H */ |